Centrality, rapidity and transverse momentum dependence of the J/$\psi$ suppression in Pb-Pb collisions at $\sqrt{s_{NN}}$=2.76 TeV
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2014-06Author
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The inclusive J/$\psi$ nuclear modification factor ($R_{AA}$) in Pb-Pb collisions at $\sqrt{s_{NN}}$=2.76TeV has been measured by ALICE as a function of centrality in the $e^+e^-$ decay channel at mid-rapidity |y| < 0.8 and as a function of centrality, transverse momentum and rapidity in the $\mu^+\mu^-$ decay channel at forward-rapidity 2.5 < y < 4.The J/$\psi$ yields measured in Pb-Pb are suppressed compared to those in pp collisions scaled by the number of binary collisions.The $R_{AA}$ integrated over a centrality range corresponding to 90% of the inelastic Pb-Pb cross section is 0.72 +- 0.06 (stat.) +- 0.10 (syst.) at mid-rapidity and 0.57 +- 0.01 (stat.) +- 0.09 (syst.) at forward-rapidity. At low transverse momentum, significantly larger values of $R_{AA}$ are measured at forward-rapidity compared to measurements at lower energy.These features suggest that a contribution to the J/$\psi$ yield originates from charm quarks (re)combination in the deconfined partonic medium.
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Alme J, Erdal HA, Helstrup H, Hetland KF, Kileng B, Altinpinar S, Djuvsland Ø, Fehlker D, Haaland ØS, Huang M, Langøy R, Lien JA, Lønne P, Nystrand J, Rehman Au, Røhrich D, Skjerdal K, Ullaland K, Wagner B, Yang S, Arsene IC, Bätzing P, Dordic O, Eyyubova G, Lindal S, Milosevic J, Qvigstad H, Richter M, Røed K, Skaali TB, Tveter TS, Wikne JC, Zhao C, Abelev B, Adam J, Adamová D, Aggarwal MM, Aglieri Rinella G, Agocs AG, Agostinelli A, Ahammed Z, Ahmad N, Ahmad Masoodi A, Ahn SU, Ahn S, Ajaz M, Akindinov A, Aleksandrov D, Alessandro B, Alici A, Alkin A, ALICE C. Centrality, rapidity and transverse momentum dependence of J/ψ suppression in Pb-Pb collisions at √s<sub>NN</sub>= 2.76TeV. Physics Letters B. 2014;734:314-327Publisher
ElsevierSubject
Relativistic heavy ion collisionsQuark gluon plasmaQuarkoniumJ/ψ suppressionExperimental resultsCollections
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